35．　 To save the drowning child, the boy plunged into the icy water without hesitation, ____ his own safety.

A. despite of　　 B. regardless of　 C. unaware of　　　 D. because of

34．　 -It’s the office! So you ________ know eating is not allowed here.

-Oh, sorry.

A. must　　　　　 B. will　　　　　 C. may　　　　　　 D. need

33．　 I called Hannah many times yesterday evening, but I couldn’t get through. Her brother ________ on the phone all the time!

A. was talking　　 B. has been talking　　　　　　　　 C. has talked　　 D. talked